Door locking mechanism



May 28, 1957 w. J. DUVALL DooR LOCKING MECHANISM 2 sheets-sheet 1 Filed Nov. l5, l954 R O 2 m 8 2 E 8/.1 m 7^/ ///M M L a g m ^vH C v F U D 2 n J. 6 l 8 1 4 (l R 2 /h 4 I. L 41.7 (rk A 8 .A\ .A 4 u n ,N 3 8 8 \H 6 6 O 4 ww w, w 7 ,el l k 3 f J/ 6 2 0 I. I. M 4 6 .w M M d n G 8 2 f f 4 f 4 6 l. .n 2 WT N1- 5 E J 6 2 .l u U 4 n 4 U H 4 3 n Hell, i 4 n 2 ZZ 6 e H 4L n 5 6 HNI 8 H|||||| M H Q 2 K |Hil mi ll /r///////// m. hw F 4 mf @we W FIG. 3

ATTORNEY May 28, 1957 w. J. DUvALl.

DooR LOCKING MECHANISM 2 Sheets-Sheet 2 Filed Nov. 15, 1954 FIG.8

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ATTORNEY Doon LocKiNG MECHANISM Walter I. Duvall, Chula 1Vista, Calif. Application' November 1s; 1954, serial No. 468,680 7 claims.V @N92- 165) This invention relates to a locking door pull for sliding doors.

It is an object of my invention to provide an improved, simple, efficient and economically constructed locking door pull for sliding doors.

It is more particularly an object of my invention to provide such a device which can'b'e set in locked position while the door is open or closed,- but which will actually not lock unless and until the door is closed. In this way, it is impossible for the user to close a locked door and damage the locking mechanism.

It is a further object of my invention to provide a device of the class described which is so compact and narrow in width that it will lit .within a ynotch cut in the front edge of the narrowest sliding doors in conventional use'gat the present time. 4 p

Y Because of the complex mechanical nature of the door locking mechanism of the present invention, further aims and objects of the invention arebest more fully explained in conjunction with an explanation of the accompanying drawings illustrating a door locking mechanism constructed in accordance With my invention'.-

While I have shown in the accompanying drawings a preferred embodiment of my invention, it should be understood that the same is susceptible of modi'cation and change without departing from the spirit of my invention.

Referring to the drawings, Fig. 1 is a front viewl of a locking door pull of my invention;

Fig. 2 is a cross-sectional view taken on line 22fof Fig. l;

Fig. 3 is a cross-section view taken on line 3--3 of Fig. l;

Fig. 4 is a cross-sectional view taken on line 4-4 of Fig. l;

Fig. 5 is a cross-sectional view taken on hne 5*-5-of Fig. 1;

Fig. 6 is an isometric view of a latch employed with the invention;

Fig. 7 is an-isometric view of a latch retainer employed with the invention; i j

Fig.y 8 is a side view of a locking door pull of the invention partially broken away to show certain constructional details.

A preferred embodiment which has been selected to illustrate my invention comprises a locking door pull having a housing 12. A cover 14 having an elongated front opening 16 is adapted to fit over an enlarged front section 18 of housing 12. Housing 12 is provided with a narrower back section 22 formed with an enlarged side opening 24 therein for use in assembling the lock mechanism.

A pull 26 having parallel attaching lugs 28 at its upper end is mounted by means of pivot pins 30 upon the interior of the front section 18 so that the front face of an elongated shank 32 forming part of the pull 26 is normally held by gravity so that it lies flush Within the front opening 16 when not in use. A projection 34 is 2 att'ached'to-the bottom` ofthe shank 32 -so as to normally project' into the front section 18 when the door pull 26 is not inuse. `In use', the door pull 26 may be swung out Athrough theopening 16 by merely pressing on the upper portion of the shank 32 to move the bottom of shank 32 outwardly. The projection 34 can then be grasped to pull a door (not shown) to which the cornplete locking mechanism is attached by mounting the same in a notch which is cut in the front edge of the door.

. As is most clearly seen in Figs. 1 and 2 of the drawings, the pull 26 is spaced from the top of the front opening 16 so asy to provide a space through which a hook 36 may be passed in using thecomplete lock mechanism as shown in Fig. 8 of the drawing. Immediatelyin back of this opening 16 there is positioned a sliding latch retainer 38 including side projections 40. These side projectons 40 are normally held upon shoulders 42 defining a latch retainer slide within .the front section 18. This latch .retainer 38 is formed having a top wall 44 which slides against a top 46 of the housing 12. The latch retainer 3S is normally urged toward the front opening 16 by means of a spring 48 located between the vertical leg of an L-shaped support S0 secured within the housing 12 and a frontwall 52 forming a part of the sliding latch retainer 38. Thus, as is most apparent in Fig. 2 of the drawings`,the'spring 48 passes through an opening 54 formed within the -latch retainer 38. The springv 48 ,is' held in .position'with respect to the support 50 by. means of a small projection 56 which is attached to this support 50 so as to pass into the end of the spring. 48 adjacent to the support.

The latch retainer includes a lower projection 58 having a bottom wall 60 which is designed to slide upon thevhorizontal leg of the support 50. This projection 58 is designed to normally. engage a notch 62'formed upon a latch 64pm `order to control the movement of` this latch 64. The latch64'is formed of the shape indicated in Fig. 6 of-the drawings. From an examination-'of this figure in conjunction withFigs. 2, 3, 5 and 8 of the drawings, it will be seen that the latch 64V includes elongated sides66 Whichare designed to slide upon shoulders 68 formed within the front section 18 from an open position as indicated in Fig. 3 of the drawings to a closed position as indicated in Fig; 8` of thek drawings.

The latch 64 is normally urged toward this closed -position through the action' of a pair of coil springsi70 which are located between theshoulders 68 and the sides of the frontsection 18 so as to rest against/the bottom of this front section 18'and exert upward pressure against a pair of small lugs 72 formed upon the sides 66. The main body 74 Aof the' latch 64 projects back through'the front section 18 toward the back section 22 where it is provided with a generally circular socket 76 which is designed to hold a'cylindrical.ball-shapedsegment 78 formed upon the front-end of a control arm which projects from the back section 22 into the front section 18;

One end of the'contiol arm 80 `is pivotally mounted on a shaft 32.- The control arm 80 is provided with a cam surface which cooperates with a cam' 92 which is formedv on a rotating locking member 94.

A retainer plate 84 is secured to the housing 12'by small pins 86engaged ho1es'88 formed in the back section 22 as indicated in Fig. 2 of the drawings. The retainer plate 84 covers the back portion of the locking mechanism and is provided with a centrally disposed vcircular opening into which lits a circular shoulder 96 formed upon the locking member 94.

The locking member 94y is provided with a centrally disposed square opening 98 which is designed; to' be engaged by means ofV a conventional square shaft (not ratented May 28, 1957 shown) of the type normally secured to manually operated control means used with a locking mechanism. '1`he locking member 94 is provided `with a iirst flat surface 100 which is designed to bear against another at surface 102 formed upon a locking retainer 104. lThe locking retainer 104 is generally U-shaped, land includes sides 106 which are designed to slide vertically between the back of the vertical leg of iL-shaped support 50 and another suppoit member `108 secured to the housing `12. It is normally biased toward the locking member 94 by means of a coil spring 110 which is positioned between the locking retainer 104 and a lug 112 secured to the housing 12. The locking member 94 also includes a second at surface 114 which is designed to t against the iiat surface 102 of the locking retainer 104 when the locking member 94 `is turned so as to remove the cam 92 from contact with the cam surface 90 of the control arm 80.

The flat surfaces 114 and 102 act to hold the Il-ocking member 94 in a iixed unlocked position. The iiat surface 100 cooperates with the dat surface 102 to serve the same function when the locking member 94 is in locked position as shown in Fig. 2. The result is that the lock is held directly in either locked or unlocked position. This may be important when a user merely looks at the lock `control to determine Whether or not the door is locked.

The edge of the cam 92 engages the corner of the locking retainer 104 to act as a stop to limit the clockwise rotation of the locking member 94. The opposite end of the cam 92 engages the rounded pivotal portion of the control arm 80 adjacent the shaft 82 rto `act as a stop to limit the counter-clockwise rotation of the locking member 94.

When the locking member 94 is moved out of con- .tact with the control Aarm 80, the latch 64 is normally urged by the springs 70 so ythat the notch 62 is titted against the projection 58 on the latch retainer 38. When the `complete locking mechanism is so disposed, it is ready for use in locking. When the door is closed, the hook 36 passes through the front opening 16 and bears against Ithe latch retainer 38, pushing it back drom the extended position shown in Fig. 2 to the Withdrawn position indicated in Fig. 8. As this occurs, the projection 58 is forced out of contact with ythe notch 62, enabling the latch 64 to be moved upwardly by the action of the springs 70 to a closed position. When this occurs, the latch 64 engages the hook 36 as indicated in Fig. 8 of the drawings and the hook is locked within the locking mechanism.

To unlock the locking mechanism so that the hook 36 is released, the locking member 94 is rotated by external manual control, forcing the cam 92 against the cam surface 90 of the control arm 80. Through the action of the socket 76 and the ball-shaped segment 78 constituting a ball and socket joint, the latch 64 is moved downwardly to an open position, as shown in Fig. 2. When this occurs the hook 36 is released yand when it is removed from the locking mechanism, fthe latch retainer 38 is moved by virtue of the action of the spring 48 so that the projection 58 tits again within the notch 62.

Those skilled in the art will realize from the foregoing description that the mechanism herein described is comparatively simple -to construct, is relatively inexpensive and is effective for the purpose intended. By virtue of the symmetrical construction of the latch .slide and the latch retainer, there is very little danger of binding occurring during use which would tend to prevent the normal operation of the latch and latchretainer. IThese parts may, if desired, be termed as being bi-laterally symmetrical about a plane of symmetry passing through the door pull, latch and latch retainer, along the line 2 2 shown in Fig. l of the drawings.

I claim:

l. A door locking mechanism comprising a housing,

means forming a latch slide within said housing, va latch positioned Within said latch slide and adapted to slide along said latch slide lfrom `an open position to a closed position, first spring means located within said housing between said latch 1an-d housing so as to normally hold said latch in closed position, means forming a latch retainer slide within said housing, a latch retainer positioned so as to project into said latch retainer slide, said latch retainer adapted to slide along said latch retainer slide from a retracted position wherein said latch retainer is out of contact with said latch to an extended position wherein -said latch retainer engages and prevents the movement of said latch to said closed position, second spring means located within said housing between part of said housing and said latch retainer, said second spring means serving to normally force said latch retainer toward said extended position, a control arm pivotally mounted `within said housing, said control arm engaging said latch and `adapted to slide said latch within said housing from said closed position to said open position against the pressure -of said first spring means when said control arm is pivoted, a flocking member rotatably mounted within said housing, said locking member having an opening therein for engagement with an actuating member, said locking member having cam means formed on the outer surface thereof, said cam means being .adapted to engage said control arm to cause said control arm to pivot and move said latch :from said closed to sad open position, said cam meansadapted to prevent -the reverse pivotal movement of said control arm when engaged therewith and to permit such movement when not engaged therewith.

2. A door locking mechanism as defined in claim l, said housing having a recess adjacent said latch retainer, said recess adapted to permit a hook to enter said housing and move said latch retainer from extended to retracted position, permitting said latch to move upwardly `and engage said hook Whenever said locking member and control arm are disengaged.

3. A door `locking mechanism as deiined in claim l, including a locking retainer for said locking member movably mounted within said housing, and spring means located -between said housing and said locking retainer `so as to normally urge said locking retainer toward said locking member, said locking member having a nonnound `exterior surface, said non-round surface being adapted to engage a similar surface on said ilocking retainer to prevent undesired rotation of said locking member.

4. A door locking mechanism as Vdeiined in claim 1, 'wherein said latch, latch retainer and slides are -bilaterally symmetrical about va plane of symmetry passing through said door pull, latch and latch retainer.

5. A door locking mechanism comprising a housing, a latch slidably located Within said housing, first spring means located within said housing between said latch and said housing so as to normally move said latch toward closed position, a latch retainer slidably positioned Within said housing, second spring means located within said housing normally urging said latch retainer into an eX- tended position wherein said latch retainer is capable of limiting the movement of said latch toward said closed position, said latch retainer adapted to be moved from said extended position to permit movement of said latch to closed position, means located within said housing for moving said latch from said closed position back to a position where its movement is limited by said latch retainer, said means including an arm pivotally mounted within said housing, ball-shaped means formed on an extremity of said arm, and socket means formed within said latch engaging said ball-shaped means, said housing having an opening adjacent said latch retainer to permit the entry of a hook into said housing, said hook adapted x#to move said latch retainer from extended position against the pressure of said second spring means, said latch thereupon adapted to be moved to closed position by said rst spring means to engage said hook, said latch adapted to be disengaged from said hook by pivotal movement of said arm.

6. A door locking mechanism comprising a housing, means forming a latch slide within said housing, a latch positioned within said latch slide and adapted to slide along said latch slide from an open position to a closed position, spring means located within said housing between said latch and housing so as to normally hold said latch in closed position, a control arm pivotally mounted within said housing, said control arm engaging said latch and adapted to slide said latch within said housing from said closed position to said open position against the pressure of said spring means when said control arm is pivoted, and a locking member rotatably mounted within said housing, said locking member having cam means formed on the outer surface thereof, said cam means being adapted to engage said control arm to cause said control arm to pivot and move said latch from closed to open position, said cam means adapted to prevent the reverse pivotal movement of said control arm when engaged therewith and to permit such movement when not in engagement therewith.

7. A door locking mechanism as defined in claim 6, including a locking retainer for said locking member movably mounted within said housing, and spring means located between said housing and said locking retainer so as to normally urge said locking retainer toward said locking member, said locking member having a nonround exterior surface, said non-round surface being adapted to engage a similar surface on said locking retainer to prevent undesired rotation of said locking member.

References Cited in the le of this patent UNITED STATES PATENTS 332,995 Cline Dec. 22, 1885 810,927 Emmert Jan. 30, 1906 1,919,763 Allen Iuly 25, 1933 20 2,668,319 Keys et al Feb. 9, 1954 2,682,424 Adams et al. June 29, 1954 

